--- /dev/null
+/*
+ * Description:
+ * Device Driver for the Infineon Technologies
+ * SLD 9630 TT Trusted Platform Module
+ * Specifications at www.trustedcomputinggroup.org
+ *
+ * Copyright (C) 2005, Marcel Selhorst <selhorst@crypto.rub.de>
+ * Applied Data Security Group, Ruhr-University Bochum, Germany
+ * Project-Homepage: http://www.prosec.rub.de/tpm
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation, version 2 of the
+ * License.
+ *
+ */
+
+#include "tpm.h"
+
+/* Infineon specific definitions */
+/* maximum number of WTX-packages */
+#define TPM_MAX_WTX_PACKAGES 50
+/* msleep-Time for WTX-packages */
+#define TPM_WTX_MSLEEP_TIME 20
+/* msleep-Time --> Interval to check status register */
+#define TPM_MSLEEP_TIME 3
+/* gives number of max. msleep()-calls before throwing timeout */
+#define TPM_MAX_TRIES 5000
+#define TCPA_INFINEON_DEV_VEN_VALUE 0x15D1
+#define TPM_DATA (TPM_ADDR + 1) & 0xff
+
+/* TPM header definitions */
+enum infineon_tpm_header {
+ TPM_VL_VER = 0x01,
+ TPM_VL_CHANNEL_CONTROL = 0x07,
+ TPM_VL_CHANNEL_PERSONALISATION = 0x0A,
+ TPM_VL_CHANNEL_TPM = 0x0B,
+ TPM_VL_CONTROL = 0x00,
+ TPM_INF_NAK = 0x15,
+ TPM_CTRL_WTX = 0x10,
+ TPM_CTRL_WTX_ABORT = 0x18,
+ TPM_CTRL_WTX_ABORT_ACK = 0x18,
+ TPM_CTRL_ERROR = 0x20,
+ TPM_CTRL_CHAININGACK = 0x40,
+ TPM_CTRL_CHAINING = 0x80,
+ TPM_CTRL_DATA = 0x04,
+ TPM_CTRL_DATA_CHA = 0x84,
+ TPM_CTRL_DATA_CHA_ACK = 0xC4
+};
+
+enum infineon_tpm_register {
+ WRFIFO = 0x00,
+ RDFIFO = 0x01,
+ STAT = 0x02,
+ CMD = 0x03
+};
+
+enum infineon_tpm_command_bits {
+ CMD_DIS = 0x00,
+ CMD_LP = 0x01,
+ CMD_RES = 0x02,
+ CMD_IRQC = 0x06
+};
+
+enum infineon_tpm_status_bits {
+ STAT_XFE = 0x00,
+ STAT_LPA = 0x01,
+ STAT_FOK = 0x02,
+ STAT_TOK = 0x03,
+ STAT_IRQA = 0x06,
+ STAT_RDA = 0x07
+};
+
+/* some outgoing values */
+enum infineon_tpm_values {
+ CHIP_ID1 = 0x20,
+ CHIP_ID2 = 0x21,
+ DAR = 0x30,
+ RESET_LP_IRQC_DISABLE = 0x41,
+ ENABLE_REGISTER_PAIR = 0x55,
+ IOLIMH = 0x60,
+ IOLIML = 0x61,
+ DISABLE_REGISTER_PAIR = 0xAA,
+ IDVENL = 0xF1,
+ IDVENH = 0xF2,
+ IDPDL = 0xF3,
+ IDPDH = 0xF4
+};
+
+static int number_of_wtx;
+
+static int empty_fifo(struct tpm_chip *chip, int clear_wrfifo)
+{
+ int status;
+ int check = 0;
+ int i;
+
+ if (clear_wrfifo) {
+ for (i = 0; i < 4096; i++) {
+ status = inb(chip->vendor->base + WRFIFO);
+ if (status == 0xff) {
+ if (check == 5)
+ break;
+ else
+ check++;
+ }
+ }
+ }
+ /* Note: The values which are currently in the FIFO of the TPM
+ are thrown away since there is no usage for them. Usually,
+ this has nothing to say, since the TPM will give its answer
+ immediately or will be aborted anyway, so the data here is
+ usually garbage and useless.
+ We have to clean this, because the next communication with
+ the TPM would be rubbish, if there is still some old data
+ in the Read FIFO.
+ */
+ i = 0;
+ do {
+ status = inb(chip->vendor->base + RDFIFO);
+ status = inb(chip->vendor->base + STAT);
+ i++;
+ if (i == TPM_MAX_TRIES)
+ return -EIO;
+ } while ((status & (1 << STAT_RDA)) != 0);
+ return 0;
+}
+
+static int wait(struct tpm_chip *chip, int wait_for_bit)
+{
+ int status;
+ int i;
+ for (i = 0; i < TPM_MAX_TRIES; i++) {
+ status = inb(chip->vendor->base + STAT);
+ /* check the status-register if wait_for_bit is set */
+ if (status & 1 << wait_for_bit)
+ break;
+ msleep(TPM_MSLEEP_TIME);
+ }
+ if (i == TPM_MAX_TRIES) { /* timeout occurs */
+ if (wait_for_bit == STAT_XFE)
+ dev_err(&chip->pci_dev->dev,
+ "Timeout in wait(STAT_XFE)\n");
+ if (wait_for_bit == STAT_RDA)
+ dev_err(&chip->pci_dev->dev,
+ "Timeout in wait(STAT_RDA)\n");
+ return -EIO;
+ }
+ return 0;
+};
+
+static void wait_and_send(struct tpm_chip *chip, u8 sendbyte)
+{
+ wait(chip, STAT_XFE);
+ outb(sendbyte, chip->vendor->base + WRFIFO);
+}
+
+ /* Note: WTX means Waiting-Time-Extension. Whenever the TPM needs more
+ calculation time, it sends a WTX-package, which has to be acknowledged
+ or aborted. This usually occurs if you are hammering the TPM with key
+ creation. Set the maximum number of WTX-packages in the definitions
+ above, if the number is reached, the waiting-time will be denied
+ and the TPM command has to be resend.
+ */
+
+static void tpm_wtx(struct tpm_chip *chip)
+{
+ number_of_wtx++;
+ dev_info(&chip->pci_dev->dev, "Granting WTX (%02d / %02d)\n",
+ number_of_wtx, TPM_MAX_WTX_PACKAGES);
+ wait_and_send(chip, TPM_VL_VER);
+ wait_and_send(chip, TPM_CTRL_WTX);
+ wait_and_send(chip, 0x00);
+ wait_and_send(chip, 0x00);
+ msleep(TPM_WTX_MSLEEP_TIME);
+}
+
+static void tpm_wtx_abort(struct tpm_chip *chip)
+{
+ dev_info(&chip->pci_dev->dev, "Aborting WTX\n");
+ wait_and_send(chip, TPM_VL_VER);
+ wait_and_send(chip, TPM_CTRL_WTX_ABORT);
+ wait_and_send(chip, 0x00);
+ wait_and_send(chip, 0x00);
+ number_of_wtx = 0;
+ msleep(TPM_WTX_MSLEEP_TIME);
+}
+
+static int tpm_inf_recv(struct tpm_chip *chip, u8 * buf, size_t count)
+{
+ int i;
+ int ret;
+ u32 size = 0;
+
+recv_begin:
+ /* start receiving header */
+ for (i = 0; i < 4; i++) {
+ ret = wait(chip, STAT_RDA);
+ if (ret)
+ return -EIO;
+ buf[i] = inb(chip->vendor->base + RDFIFO);
+ }
+
+ if (buf[0] != TPM_VL_VER) {
+ dev_err(&chip->pci_dev->dev,
+ "Wrong transport protocol implementation!\n");
+ return -EIO;
+ }
+
+ if (buf[1] == TPM_CTRL_DATA) {
+ /* size of the data received */
+ size = ((buf[2] << 8) | buf[3]);
+
+ for (i = 0; i < size; i++) {
+ wait(chip, STAT_RDA);
+ buf[i] = inb(chip->vendor->base + RDFIFO);
+ }
+
+ if ((size == 0x6D00) && (buf[1] == 0x80)) {
+ dev_err(&chip->pci_dev->dev,
+ "Error handling on vendor layer!\n");
+ return -EIO;
+ }
+
+ for (i = 0; i < size; i++)
+ buf[i] = buf[i + 6];
+
+ size = size - 6;
+ return size;
+ }
+
+ if (buf[1] == TPM_CTRL_WTX) {
+ dev_info(&chip->pci_dev->dev, "WTX-package received\n");
+ if (number_of_wtx < TPM_MAX_WTX_PACKAGES) {
+ tpm_wtx(chip);
+ goto recv_begin;
+ } else {
+ tpm_wtx_abort(chip);
+ goto recv_begin;
+ }
+ }
+
+ if (buf[1] == TPM_CTRL_WTX_ABORT_ACK) {
+ dev_info(&chip->pci_dev->dev, "WTX-abort acknowledged\n");
+ return size;
+ }
+
+ if (buf[1] == TPM_CTRL_ERROR) {
+ dev_err(&chip->pci_dev->dev, "ERROR-package received:\n");
+ if (buf[4] == TPM_INF_NAK)
+ dev_err(&chip->pci_dev->dev,
+ "-> Negative acknowledgement"
+ " - retransmit command!\n");
+ return -EIO;
+ }
+ return -EIO;
+}
+
+static int tpm_inf_send(struct tpm_chip *chip, u8 * buf, size_t count)
+{
+ int i;
+ int ret;
+ u8 count_high, count_low, count_4, count_3, count_2, count_1;
+
+ /* Disabling Reset, LP and IRQC */
+ outb(RESET_LP_IRQC_DISABLE, chip->vendor->base + CMD);
+
+ ret = empty_fifo(chip, 1);
+ if (ret) {
+ dev_err(&chip->pci_dev->dev, "Timeout while clearing FIFO\n");
+ return -EIO;
+ }
+
+ ret = wait(chip, STAT_XFE);
+ if (ret)
+ return -EIO;
+
+ count_4 = (count & 0xff000000) >> 24;
+ count_3 = (count & 0x00ff0000) >> 16;
+ count_2 = (count & 0x0000ff00) >> 8;
+ count_1 = (count & 0x000000ff);
+ count_high = ((count + 6) & 0xffffff00) >> 8;
+ count_low = ((count + 6) & 0x000000ff);
+
+ /* Sending Header */
+ wait_and_send(chip, TPM_VL_VER);
+ wait_and_send(chip, TPM_CTRL_DATA);
+ wait_and_send(chip, count_high);
+ wait_and_send(chip, count_low);
+
+ /* Sending Data Header */
+ wait_and_send(chip, TPM_VL_VER);
+ wait_and_send(chip, TPM_VL_CHANNEL_TPM);
+ wait_and_send(chip, count_4);
+ wait_and_send(chip, count_3);
+ wait_and_send(chip, count_2);
+ wait_and_send(chip, count_1);
+
+ /* Sending Data */
+ for (i = 0; i < count; i++) {
+ wait_and_send(chip, buf[i]);
+ }
+ return count;
+}
+
+static void tpm_inf_cancel(struct tpm_chip *chip)
+{
+ /* Nothing yet!
+ This has something to do with the internal functions
+ of the TPM. Abort isn't really necessary...
+ */
+}
+
+static DEVICE_ATTR(pubek, S_IRUGO, tpm_show_pubek, NULL);
+static DEVICE_ATTR(pcrs, S_IRUGO, tpm_show_pcrs, NULL);
+static DEVICE_ATTR(caps, S_IRUGO, tpm_show_caps, NULL);
+static DEVICE_ATTR(cancel, S_IWUSR | S_IWGRP, NULL, tpm_store_cancel);
+
+static struct attribute *inf_attrs[] = {
+ &dev_attr_pubek.attr,
+ &dev_attr_pcrs.attr,
+ &dev_attr_caps.attr,
+ &dev_attr_cancel.attr,
+ NULL,
+};
+
+static struct attribute_group inf_attr_grp = {.attrs = inf_attrs };
+
+static struct file_operations inf_ops = {
+ .owner = THIS_MODULE,
+ .llseek = no_llseek,
+ .open = tpm_open,
+ .read = tpm_read,
+ .write = tpm_write,
+ .release = tpm_release,
+};
+
+static struct tpm_vendor_specific tpm_inf = {
+ .recv = tpm_inf_recv,
+ .send = tpm_inf_send,
+ .cancel = tpm_inf_cancel,
+ .req_complete_mask = 0,
+ .req_complete_val = 0,
+ .attr_group = &inf_attr_grp,
+ .miscdev = {.fops = &inf_ops,},
+};
+
+static int __devinit tpm_inf_probe(struct pci_dev *pci_dev,
+ const struct pci_device_id *pci_id)
+{
+ int rc = 0;
+ u8 iol, ioh;
+ int vendorid[2];
+ int version[2];
+ int productid[2];
+
+ if (pci_enable_device(pci_dev))
+ return -EIO;
+
+ dev_info(&pci_dev->dev, "LPC-bus found at 0x%x\n", pci_id->device);
+
+ /* query chip for its vendor, its version number a.s.o. */
+ outb(ENABLE_REGISTER_PAIR, TPM_ADDR);
+ outb(IDVENL, TPM_ADDR);
+ vendorid[1] = inb(TPM_DATA);
+ outb(IDVENH, TPM_ADDR);
+ vendorid[0] = inb(TPM_DATA);
+ outb(IDPDL, TPM_ADDR);
+ productid[1] = inb(TPM_DATA);
+ outb(IDPDH, TPM_ADDR);
+ productid[0] = inb(TPM_DATA);
+ outb(CHIP_ID1, TPM_ADDR);
+ version[1] = inb(TPM_DATA);
+ outb(CHIP_ID2, TPM_ADDR);
+ version[0] = inb(TPM_DATA);
+
+ if ((vendorid[0] << 8 | vendorid[1]) == (TCPA_INFINEON_DEV_VEN_VALUE)) {
+
+ /* read IO-ports from TPM */
+ outb(IOLIMH, TPM_ADDR);
+ ioh = inb(TPM_DATA);
+ outb(IOLIML, TPM_ADDR);
+ iol = inb(TPM_DATA);
+ tpm_inf.base = (ioh << 8) | iol;
+
+ if (tpm_inf.base == 0) {
+ dev_err(&pci_dev->dev, "No IO-ports set!\n");
+ pci_disable_device(pci_dev);
+ return -ENODEV;
+ }
+
+ /* activate register */
+ outb(DAR, TPM_ADDR);
+ outb(0x01, TPM_DATA);
+ outb(DISABLE_REGISTER_PAIR, TPM_ADDR);
+
+ /* disable RESET, LP and IRQC */
+ outb(RESET_LP_IRQC_DISABLE, tpm_inf.base + CMD);
+
+ /* Finally, we're done, print some infos */
+ dev_info(&pci_dev->dev, "TPM found: "
+ "io base 0x%x, "
+ "chip version %02x%02x, "
+ "vendor id %x%x (Infineon), "
+ "product id %02x%02x"
+ "%s\n",
+ tpm_inf.base,
+ version[0], version[1],
+ vendorid[0], vendorid[1],
+ productid[0], productid[1], ((productid[0] == 0)
+ && (productid[1] ==
+ 6)) ?
+ " (SLD 9630 TT 1.1)" : "");
+
+ rc = tpm_register_hardware(pci_dev, &tpm_inf);
+ if (rc < 0) {
+ pci_disable_device(pci_dev);
+ return -ENODEV;
+ }
+ return 0;
+ } else {
+ dev_info(&pci_dev->dev, "No Infineon TPM found!\n");
+ pci_disable_device(pci_dev);
+ return -ENODEV;
+ }
+}
+
+static struct pci_device_id tpm_pci_tbl[] __devinitdata = {
+ {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801BA_0)},
+ {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_12)},
+ {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_0)},
+ {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_12)},
+ {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801EB_0)},
+ {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH6_0)},
+ {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH6_1)},
+ {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH6_2)},
+ {0,}
+};
+
+MODULE_DEVICE_TABLE(pci, tpm_pci_tbl);
+
+static struct pci_driver inf_pci_driver = {
+ .name = "tpm_inf",
+ .id_table = tpm_pci_tbl,
+ .probe = tpm_inf_probe,
+ .remove = __devexit_p(tpm_remove),
+ .suspend = tpm_pm_suspend,
+ .resume = tpm_pm_resume,
+};
+
+static int __init init_inf(void)
+{
+ return pci_register_driver(&inf_pci_driver);
+}
+
+static void __exit cleanup_inf(void)
+{
+ pci_unregister_driver(&inf_pci_driver);
+}
+
+module_init(init_inf);
+module_exit(cleanup_inf);
+
+MODULE_AUTHOR("Marcel Selhorst <selhorst@crypto.rub.de>");
+MODULE_DESCRIPTION("Driver for Infineon TPM SLD 9630 TT");
+MODULE_VERSION("1.4");
+MODULE_LICENSE("GPL");
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